Patent GB-190804629-A (GB)
Title: Improvements in or relating to Power Transmitting and Locking Devices.
Inventor: CLEMENCET LOUIS EUGENE
Filed: 1908-02-29
Granted: 1909-03-01
Abstract: 4629. ClÚmencet, L. E. March 2, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Gas and like engines, starting. Relates to devices in which there are two cams, which may be curved or straight surfaces, worms, spirals, involutes, screws, eccentrics, swash-plates, &c., one of which, on being displaced relatively to the other, produces driving or locking engagement with a third member bearing on the two cams, such third member consisting of rollers, balls, slide blocks &c., nuts, rings, plates, &c. and being also adapted upon displacement to engage the cams, the said cams being provided with removable or permanent stops adapted to engage each other in such a manner that driving or looking engagement and disengagement of the members in any desired direction of motion may be obtained. Such devices are applicable, among other things, as ratchet clutches and detent devices, allowing free motion in either or both directions if desired. A number of modifications showing different forms of cam surface &c. are described. In one form, Figs. 1 and 3, the parts F, G carry cam surfaces adapted to engage balls or rollers 1, 3, 4, &c. sliding radially in a ring H secured to the shaft R. The inclination of the cam surfaces are such as not to cause slipping of the surfaces when one of the members is rotated. The shape of the cams is immaterial unless disengagement of the ring H is desired, in which case the groove between the parts F, G must be of uniform width throughout its length, the number of rollers being different from the number of cam curves, or the rollers being not placed equidistant from each other. Instead of the rollers, slide blocks 2 or rollers or slide blocks pivoted by means of links on the ring H may be employed. A flexible but not compressible ring or a chain constituted by any desired number of slide blocks may be used. The cams F, G may be elliptical. The cam surfaces may be arranged on the lateral faces of the parts F, G, as shown in Fig. 11, and oscillating slide blocks K, Fig. 13, keyed to the spindle R may be employed. The cam-surfaces may be so arranged that the slide blocks &c. have a combined lateral and radial movement. The cams may consist of worms F, G, Fig. 14, one or both of which may be internal, engaging pinions C pivoted on a spider H secured to the spindle R. Instead of the worms, spiral or involute threads engaging opposite sides of the pinions may be used. The parts F, G may be provided with screw - threads, engaging internally or externally a screw - threaded part sliding on the part H. The cams may consist of circular faces eccentric to the shaft R, in which case, Fig. 25, a rigid circular ring K .provided with a projection K<1> engaging and oscillating in a radial slot in the part H, or with a slot engaging a projection on the part H or the shaft R, may be used. The ring K may engage both cam parts internally or externally. The parts F, G may be formed as swash-plates with inclined faces engaged by a flat plate K loosely engaging the part H or keyed to the shaft R, as shown in Fig. 43. The plate K may engage the parts F, G on their exterior faces, and may be recessed to receive rollers, balls, or slide blocks. When applied for obtaining rectilinear movements, the parts F, G, Fig. 23, may be formed with flat faces, a rigid block K bearing on them being carried in a slot in the part H. In any of the above forms, if the.part F, for instance, is moved relatively to the part G, the part H will become locked between the other parts and the three parts will move together. Similarly, movement of the part G or H will cause locking of all three parts. If the parts F, G are provided with stops J, I, respectively, as shown in Fig. 3, the part F being the driving-part, the part H the driven part, and the part G a loose ring, movement of the part F in the direction f will drive the part H, but, if the-part H over-runs, the stop I will be brought against the stop J, forming a groove between the parts F, G, which is designed to be of uniform width, and the part H will be able to travel independently of the part F, the device acting as a 'free-wheel.' In the modification in which the parts F, G, H are provided with screw-threads, the number of revolutions of the over-running part are limited by the necessary longitudinal movement of one of the parts. In order to allow in addition free backward movement of the over-running part it is necessary to keep, by means of an adjustable tappet, the stops I, J in engagement during this backward movement. In the case of the free-wheel device, this is accomplished by means of a fixed pawl or the like preventing only the backward movement of the loose part G, or by means of a detent device, as described above, having the same action. In all the above arrangements the stops may be arranged to come into contact in the opposite direction of motion, and, where possible, the functions of the three parts F, G, H are interchangeable. Motion may be communicated to two or more different parts by providing one driving-part with two or more sets of driving-surfaces. The Specification, in the original form, as open to inspection under Section 91 (3) (a), compries also the following additional matter : Cranks for starting explosion and other engines, by means of which the turning back of the driving-part is avoided. In a freewheel device, the backward rotation of the driven part, as mentioned above, may be obtained by a second stop on the part G on the other side of the stop J rising when the part G rotates in the direction of the arrow f, and descending and striking the stop J when the part G rotates in the opposite direction. The two stops on the part G can constitute a single fork acting in a similar manner, and they may be formed on the part F. This subject-matter does not appear in the Complete Specification as accepted.